AS200887 VELCOM-IT Velcom Srl

AS overview

Test target: 2a13:1580::1 · static prefix probe · address space: PA · prefixes announced: 1

prefix(es): 2a13:1580::/29

Targets & per-vantage-point probe results (1 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2a13:1580::1`	prb	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	?	?	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a13:1580::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS200887 /29 maxLen 29 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

We probed 35 arbitrary IPv6 address(es) inside AS200887's announced prefix(es). No router inside the prefix responded. The deepest visible hop was fd13:1580::2 at hop 18 - that router does not answer ICMPv6 Echo. This is not in AS200887's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T12:09:22Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

● SRB host (SOX, Belgrade)
● DE host (Berlin)
● DE host (Düsseldorf)
● NL host (go6lab)
● ITA host (Karsolink)
● SLO host (6connect)
● SLO host (T-2)
── solid line = echo reply, PTB honored (clean reach)
— — dashed line = echo reply but PTB not honored (RFC 4890 violation)
no line = no echo reply (never reached)
◉ target: green = clean, amber = reachable-but-violation / unreachable
⚠ suspected drop AS
⋯ silent (unanswered) hops
● IXP hop

From SRB host (SOX, Belgrade) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 52.7ms

4/4

Echo 1500B (DF) 52.6ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.4ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	2001:7f8:1e::108	0.3ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:b28:3ff::a16f:0:1	42.9ms	0%	AS31500	GNM-AS - Global Network Management Inc, AG
4	2a03:b020::254	52.9ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a03:b020:1:5c::b	50.3ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6	2a13:1580::1	52.2ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 1500
 1:  _gateway                                              0.742ms 
 1:  _gateway                                              0.358ms 
 2:  2001:7f8:1e::108                                      0.685ms 
 3:  2001:b28:3ff::a16f:0:1                               44.410ms 
 4:  2a03:b020::254                                       54.190ms asymm  6 
 5:  2a03:b020:1:5c::b                                    50.516ms asymm  7 
 6:  2a13:1580::1                                         57.581ms reached
     Resume: pmtu 1500 hops 6 back 8

From DE host (Berlin) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 34.7ms

4/4

Echo 1500B (DF) 34.7ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1	30.0ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.7ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-10.cr10.ber03.lwlcom.net 2a00:c380:b200:230::220	0.6ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-15.cr11.dtm01.lwlcom.net 2a00:c380:b200:230::5	8.3ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-10.cr10.dtm02.lwlcom.net 2a00:c380:b200:230::255	8.8ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae0-50.cr10.dus02.lwlcom.net 2a00:c380:b200:230::24	8.2ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
7	ae0-20.cr10.dus01.lwlcom.net 2a00:c380:b200:230::108	8.9ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
8	ae6-60.cr10.ams01.lwlcom.net 2a00:c380:b200:230::213	11.3ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
9	2001:7f8:12a::18	14.7ms	0%	-	NA
10	2a03:b020::254	33.0ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
11	2a03:b020:1:5c::b	32.8ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
12	2a13:1580::1	34.6ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

tracepath -6

 1?: [LOCALHOST]                        0.017ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.303ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.310ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.755ms 
 3:  ae0-10.cr10.ber03.lwlcom.net                          1.101ms 
 4:  ae0-15.cr11.dtm01.lwlcom.net                          8.906ms asymm  5 
 5:  ae0-20.cr10.dtm01.lwlcom.net                          8.599ms asymm  4 
 6:  ae0-20.cr10.dus04.lwlcom.net                          8.725ms asymm  5 
 7:  ae0-10.cr10.dus01.lwlcom.net                          8.712ms asymm  4 
 8:  ae6-60.cr10.ams01.lwlcom.net                         11.814ms asymm  5 
 9:  2001:7f8:12a::18                                     15.108ms asymm  4 
10:  2a03:b020::254                                       33.320ms asymm  4 
11:  2a03:b020:1:5c::b                                    32.813ms asymm  5 
12:  2a13:1580::1                                         34.783ms reached
     Resume: pmtu 1500 hops 12 back 6

From DE host (Düsseldorf) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 24.1ms

4/4

Echo 1500B (DF) 24.1ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1	0.1ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ipv6.de-cix.dus.as41327.fibertelecom.com 2001:7f8:9e::a16f:0:1	4.0ms	0%	-	NA
3	2a03:b020::254	22.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
4	2a03:b020:1:5c::b	22.0ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a13:1580::1	24.2ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

tracepath -6

 1?: [LOCALHOST]                        0.018ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.278ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.243ms 
 2:  ipv6.de-cix.dus.as41327.fibertelecom.com              4.049ms 
 3:  2a03:b020::254                                       22.538ms 
 4:  2a03:b020:1:5c::b                                    22.187ms 
 5:  2a13:1580::1                                         24.137ms reached
     Resume: pmtu 1500 hops 5 back 5

From NL host (go6lab) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 30.4ms

4/4

Echo 1500B (DF) 31.3ms

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	2.4ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	2.5ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	speed-ix.fibertelecom.it 2001:7f8:b7::a504:1327:1	3.7ms	0%	-	NA
4	2a03:b020::254	27.7ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a03:b020:1:5c::b	28.6ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6	2a13:1580::1	28.8ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

tracepath -6

 1?: [LOCALHOST]                        0.034ms pmtu 1500
 1:  2a00:8642:42::2                                       3.908ms 
 1:  2a00:8642:42::2                                       3.329ms 
 2:  gw.friends.steffann.nl                                2.670ms 
 3:  speed-ix.fibertelecom.it                              6.528ms 
 4:  2a03:b020::254                                       29.318ms 
 5:  2a03:b020:1:5c::b                                    29.830ms 
 6:  2a13:1580::1                                         32.951ms reached
     Resume: pmtu 1500 hops 6 back 6

From ITA host (Karsolink) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 62.3ms

3/4

Echo 1500B (DF) 20.9ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
2	2a12:d8c0:109f:121::a1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:6::1	9.7ms	-	AS204471	KARSOLINK - 2S Computers SRL, IT
4	2a03:b020:1:51::a	10.1ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a03:b020::254	18.1ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6	2a03:b020:1:5c::b	18.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
7	2a13:1580::1	20.4ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.570ms 
 1:  karsolink-01.net.karsolink.com                        0.623ms 
 2:  2a12:d8c0:109f:121::a1                                0.725ms 
 3:  no reply
 4:  2a03:b020:1:51::a                                    10.376ms 
 5:  2a03:b020::254                                       18.922ms 
 6:  2a03:b020:1:5c::b                                    18.722ms 
 7:  2a13:1580::1                                         20.935ms reached
     Resume: pmtu 1500 hops 7 back 7

From SLO host (6connect) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 29.5ms

3/4

Echo 1500B (DF) 31.0ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.5ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	2a03:a100:0:201:1::1	1.1ms	0%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	*	-	10%	-
5	100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1	7.3ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	e0-35.core2.muc1.he.net 2001:470:0:41d::2	12.6ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	ipv6.de-cix.muc.as41327.fibertelecom.com 2001:7f8:44::a16f:0:1	20.7ms	0%	-	NA
8	2a03:b020::254	27.8ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
9	2a03:b020:1:5c::b	27.6ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
10	2a13:1580::1	29.5ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

Rate-limited ICMPv6: hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.015ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.422ms 
 1:  fw1-lju.6connect.com                                  1.270ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  1.114ms 
 4:  2a03:a100:0:201:1::1                                  1.106ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.679ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                        8.930ms 
 6:  e0-35.core2.muc1.he.net                              12.351ms 
 7:  ipv6.de-cix.muc.as41327.fibertelecom.com             20.792ms asymm 10 
 8:  2a03:b020::254                                       28.033ms asymm  9 
 9:  2a03:b020:1:5c::b                                    28.093ms asymm 10 
10:  2a13:1580::1                                         30.149ms reached
     Resume: pmtu 1500 hops 10 back 11

From SLO host (T-2) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 47.6ms

4/4

Echo 1500B (DF) 48.4ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a01:260:1::225	2.8ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c	2.8ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	hurricane-electric.nikhef.nlsix.net 2001:7f8:13::a500:6939:1	34.0ms	0%*	-	NA
5	hurricane-electric.nikhef.nlsix.net 2001:7f8:13::a500:6939:1	35.9ms	0%	-	NA
6	be47.core3.ams1.he.net 2001:470:e:12::2	31.8ms	-	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be47.core3.ams1.he.net 2001:470:e:12::2	38.0ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	2001:7f8:12a::18	31.8ms	0%	-	NA
9	2a03:b020::254	39.4ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
10	2a03:b020:1:5c::b	41.1ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
11	2a13:1580::1	41.7ms	0%	AS200887	VELCOM-IT - Velcom Srl, IT

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  2a01:261:313:b814::1                                  0.726ms 
 1:  2a01:261:313:b814::1                                  0.891ms 
 2:  2a01:260:1::225                                       6.313ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        2.885ms 
 4:  2a01-260-1-1--39.core6.t-2.net                        2.764ms asymm  3 
 5:  hurricane-electric.nikhef.nlsix.net                  37.960ms asymm  4 
 6:  be47.core3.ams1.he.net                               31.667ms 
 7:  be47.core3.ams1.he.net                               38.041ms asymm  6 
 8:  ???                                                  36.977ms asymm  6 
 9:  2a03:b020::254                                       45.116ms asymm  6 
10:  2a13:1580::1                                         43.109ms reached
     Resume: pmtu 1500 hops 10 back 8